Isis became a slave during her search for Osiris
Return of the Jedi is generally seen as the least of the three original films. A lot of this has to do with the Ewoks, the feral teddy bears that are featured heavily throughout the film.
On the surface of it, The Empire Strikes Back is a old-time pulp adventure story and as such is the favorite of many Star Wars fans. The interesting thing about the film is how the story itself-- a middle piece with no dramatic resolution or climax-- is overshadowed by a stirring spiritual homily delivered by a badly-animated puppet (of all things).